class_docstr: A random shuffling buffer implementation. Items can be added to the buffer and retrieved in a random order.
code: def retrieve(self):
      if not self._done_adding and not self.can_retrieve():
          raise RuntimeError(
              'Can not dequeue. Check the return value of "can_dequeue()" to check if any '
              "items are available."
          )
      random_index = np.random.randint(0, self._size)
      return_value = self._items[random_index]
      self._items[random_index] = self._items[self._size - 1]
      self._items[self._size - 1] = None
      self._size -= 1
      return return_value
  
imports: import abc
  from collections import deque
  import numpy
  import six
label_desc: Use image node_id 3 for calling the RandomShufflingBuffer obj's underlying member method code with example usage: obj.retrieve() and returns: return_value